Nasa Mars Rover Accidentally Draws Penis On Red Planet

The twin exploration vehicles Spirit and Opportunity were launched nine years ago, in an effort to search the surface of Mars for signs of water erosion and possibly even life.

According to Nasa, since then the rovers have driven over more than 10km of Martian land, directed by teams back on Earth combined with autonomous cameras designed to avoid potential problems with the terrain.

It appears that part of the robots' programming involves spinning in tight circles to test nearby terrain and find new routes.